# Copyright 2001 David Abrahams.
# Copyright 2004, 2005 Markus Schoepflin.
# Distributed under the Boost Software License, Version 1.0.
# (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)

#| tag::doc[]

[[bbv2.reference.tools.compiler.hp_cxx]]
= HP C++ Compiler for Tru64 Unix

The `hp_cxx` modules supports the
http://h30097.www3.hp.com/cplus/?jumpid=reg_R1002_USEN[HP C++ Compiler]
for Tru64 Unix.

The module is initialized using the following syntax:

----
using hp_cxx : [version] : [c++-compile-command] : [compiler options] ;
----

This statement may be repeated several times, if you want to configure
several versions of the compiler.

If the command is not specified, B2 will search for a binary
named `hp_cxx` in PATH.

The following options can be provided, using
_`<option-name>option-value syntax`_:

`cflags`::
Specifies additional compiler flags that will be used when compiling C
sources.

`cxxflags`::
Specifies additional compiler flags that will be used when compiling C++
sources.

`compileflags`::
Specifies additional compiler flags that will be used when compiling both C
and C++ sources.

`linkflags`::
Specifies additional command line options that will be passed to the linker.

|# # end::doc[]

#
# HP CXX compiler
# See http://h30097.www3.hp.com/cplus/?jumpid=reg_R1002_USEN
#
#
# Notes on this toolset:
#
# - Because of very subtle issues with the default ansi mode, strict_ansi mode
#   is used for compilation. One example of things that don't work correctly in
#   the default ansi mode is overload resolution of function templates when
#   mixed with non-template functions.
#
# - For template instantiation "-timplicit_local" is used. Previously,
#   "-tlocal" has been tried to avoid the need for a template repository
#   but this doesn't work with manually instantiated templates. "-tweak"
#   has not been used to avoid the stream of warning messages issued by
#   ar or ld when creating a library or linking an application.
#
# - Debug symbols are generated with "-g3", as this works both in debug and
#   release mode. When compiling C++ code without optimization, we additionally
#   use "-gall", which generates full symbol table information for all classes,
#   structs, and unions. As this turns off optimization, it can't be used when
#   optimization is needed.
#

import feature generators common ;
import toolset : flags ;

feature.extend toolset : hp_cxx ;
feature.extend c++abi : cxxarm ;

# Inherit from Unix toolset to get library ordering magic.
toolset.inherit  hp_cxx : unix ;

generators.override hp_cxx.prebuilt : builtin.lib-generator ;
generators.override hp_cxx.prebuilt : builtin.prebuilt ;
generators.override hp_cxx.searched-lib-generator : searched-lib-generator ;


rule init ( version ? : command * : options * )
{
    local condition = [ common.check-init-parameters hp_cxx : version $(version) ] ;

    local command = [ common.get-invocation-command hp_cxx : cxx : $(command) ] ;

    if $(command)
    {
        local root = [ common.get-absolute-tool-path $(command[-1]) ] ;

        if $(root)
        {
            flags hp_cxx .root $(condition) : "\"$(root)\"/" ;
        }
    }
    # If we can't find 'cxx' anyway, at least show 'cxx' in the commands
    command ?= cxx ;

    common.handle-options hp_cxx : $(condition) : $(command) : $(options) ;
}

generators.register-c-compiler hp_cxx.compile.c++ : CPP : OBJ : <toolset>hp_cxx ;
generators.register-c-compiler hp_cxx.compile.c : C : OBJ : <toolset>hp_cxx ;



# No static linking as far as I can tell.
# flags cxx LINKFLAGS <runtime-link>static : -bstatic ;
flags hp_cxx.compile OPTIONS <debug-symbols>on : -g3 ;
flags hp_cxx.compile OPTIONS <optimization>off/<debug-symbols>on : -gall ;
flags hp_cxx.link OPTIONS <debug-symbols>on : -g ;
flags hp_cxx.link OPTIONS <debug-symbols>off : -s ;

flags hp_cxx.compile OPTIONS <optimization>off : -O0 ;
flags hp_cxx.compile OPTIONS <optimization>speed/<inlining>on : -O2 ;
flags hp_cxx.compile OPTIONS <optimization>speed : -O2 ;

# This (undocumented) macro needs to be defined to get all C function
# overloads required by the C++ standard.
flags hp_cxx.compile.c++ OPTIONS : -D__CNAME_OVERLOADS ;

# Added for threading support
flags hp_cxx.compile OPTIONS <threading>multi : -pthread ;
flags hp_cxx.link OPTIONS <threading>multi : -pthread ;

flags hp_cxx.compile OPTIONS <optimization>space/<inlining>on : <inlining>size ;
flags hp_cxx.compile OPTIONS <optimization>space : -O1 ;
flags hp_cxx.compile OPTIONS <inlining>off : -inline none ;

# The compiler versions tried (up to V6.5-040) hang when compiling Boost code
# with full inlining enabled. So leave it at the default level for now.
#
# flags hp_cxx.compile OPTIONS <inlining>full : -inline all ;

flags hp_cxx.compile OPTIONS <profiling>on : -pg ;
flags hp_cxx.link OPTIONS <profiling>on : -pg ;

# Selection of the object model. This flag is needed on both the C++ compiler
# and linker command line.

# Unspecified ABI translates to '-model ansi' as most
# standard-conforming.
flags hp_cxx.compile.c++ OPTIONS <c++abi> : -model ansi : : hack-hack ;
flags hp_cxx.compile.c++ OPTIONS <c++abi>cxxarm : -model arm ;
flags hp_cxx.link OPTIONS <c++abi> : -model ansi : : hack-hack ;
flags hp_cxx.link OPTIONS <c++abi>cxxarm : -model arm ;

# Display a descriptive tag together with each compiler message. This tag can
# be used by the user to explicitly suppress the compiler message.
flags hp_cxx.compile OPTIONS : -msg_display_tag ;

flags hp_cxx.compile OPTIONS <cflags> ;
flags hp_cxx.compile.c++ OPTIONS <cxxflags> ;
flags hp_cxx.compile DEFINES <define> ;
flags hp_cxx.compile INCLUDES <include> ;
flags hp_cxx.link OPTIONS <linkflags> ;

flags hp_cxx.link LIBPATH <library-path> ;
flags hp_cxx.link LIBRARIES <library-file> ;
flags hp_cxx.link FINDLIBS-ST <find-static-library> ;
flags hp_cxx.link FINDLIBS-SA <find-shared-library> ;

flags hp_cxx.compile.c++ TEMPLATE_DEPTH <c++-template-depth> ;

actions link bind LIBRARIES
{
    $(CONFIG_COMMAND) -noimplicit_include $(OPTIONS) -o "$(<)" -L$(LIBPATH) "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-ST) -l$(FINDLIBS-SA) -lrt -lm
}

# When creating dynamic libraries, we don't want to be warned about unresolved
# symbols, therefore all unresolved symbols are marked as expected by
# '-expect_unresolved *'. This also mirrors the behaviour of the GNU tool
# chain.

actions link.dll bind LIBRARIES
{
    $(CONFIG_COMMAND) -shared -expect_unresolved \* -noimplicit_include $(OPTIONS) -o "$(<[1])" -L$(LIBPATH)  "$(>)" "$(LIBRARIES)" -l$(FINDLIBS-ST) -l$(FINDLIBS-SA) -lm
}


# Note: Relaxed ANSI mode (-std) is used for compilation because in strict ANSI
# C89 mode (-std1) the compiler doesn't accept C++ comments in C files. As -std
# is the default, no special flag is needed.
actions compile.c
{
    $(.root:E=)cc -c $(OPTIONS) -D$(DEFINES) -I"$(INCLUDES)" -o "$(<)" "$(>)"
}

# Note: The compiler is forced to compile the files as C++ (-x cxx) because
# otherwise it will silently ignore files with no file extension.
#
# Note: We deliberately don't suppress any warnings on the compiler command
# line, the user can always do this in a customized toolset later on.

rule compile.c++
{
    # We preprocess the TEMPLATE_DEPTH command line option here because we found
    # no way to do it correctly in the actual action code. There we either get
    # the -pending_instantiations parameter when no c++-template-depth property
    # has been specified or we get additional quotes around
    # "-pending_instantiations ".
    local template-depth = [ on $(1) return $(TEMPLATE_DEPTH) ] ;
    TEMPLATE_DEPTH on $(1) = "-pending_instantiations "$(template-depth) ;
}

actions compile.c++
{
    $(CONFIG_COMMAND) -x cxx -c -std strict_ansi -nopure_cname -noimplicit_include -timplicit_local -ptr "$(<[1]:D)/cxx_repository" $(OPTIONS) $(TEMPLATE_DEPTH) -D$(DEFINES) -I"$(INCLUDES)" -o "$(<)" "$(>)"
}

# Always create archive from scratch. See the gcc toolet for rationale.
RM = [ common.rm-command ] ;
actions together piecemeal archive
{
  $(RM) "$(<)"
  ar rc $(<) $(>)
}
